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This shows that as the no. of hours worked will increase the amount of salary will
also increase with the constant ratio.

Symbol of Proportion

When two quantities a and b are in proportion then they are written as a ∝ b where ∝
represents “is proportion to”.
Methods to solve Direct Proportion Problems
There are two methods to solve the problems related to direct proportion-

1. Tabular Method
As we know that,

so, if one ratio is given then we can find the other values also. (The ratio remains the
constant in the direct proportion).
Example
The cost of 4-litre milk is 200 Rs. Tabulate the cost of 2, 3, 5, litres of milk of same
quality.

Solution:
Let X litre of milk is of cost Y Rs.

X(Liter) 2 3 4 5

Y(Rupees) Y2 Y3 200 Y4

We know that as the litter will increase the cost will also increase and if the litre will
decrease then the cost will also decrease.

Given,
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